TSQL使用变量重新连接字符串文本

Posted 2021-05-04

我试图将下面代码的第三行（Set @ProjectBinary）中的文件夹位置替换为变量。

原始代码：

DECLARE @ProjectBinary as varbinary(max)
DECLARE @operation_id as bigint
Set @ProjectBinary = (SELECT * FROM OPENROWSET(BULK 'C:MyProjects SSISPackage_ProjectDeployment.ispac', SINGLE_BLOB) as BinaryData)

Exec catalog.deploy_project @folder_name = 'SSIS Packages', @project_name = 'DeployViaStoredProc_SSIS', @Project_Stream = @ProjectBinary, @operation_id = @operation_id out

我创建了一个变量：DECLARE @Location AS varchar（250）='C： SSIS DWH_IS.ispac'

DECLARE @ProjectBinary as varbinary(max)
DECLARE @operation_id as bigint
Set @ProjectBinary = ('SELECT * FROM OPENROWSET(BULK ' + @Location + ', SINGLE_BLOB') as BinaryData)

Exec catalog.deploy_project @folder_name = 'SSIS Packages', @project_name = 'DeployViaStoredProc_SSIS', @Project_Stream = @ProjectBinary, @operation_id = @operation_id out

我一直收到错误：消息257，级别16，状态3，行61不允许从数据类型varchar到varbinary（max）的隐式转换。使用CONVERT函数运行此查询。

有关如何更改此代码以获取代码运行的任何建议吗？

答案

您需要按如下方式细分

DECLARE @SQL nvarchar(1000), @ProjectBinary as varbinary(max);
SET @SQL = N'SELECT @Blob = (SELECT * FROM OPENROWSET(BULK ''' + @Location + ''', SINGLE_BLOB) as BinaryData)'
EXEC sp_executesql @SQL, N'@Blob varbinary(max) OUTPUT', @ProjectBinary OUTPUT;

线Set @ProjectBinary = (..不能动态或参数化